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Nonlinear optical dynamics of excitons and trions
Author(s) -
PortellaOberli M. T.,
Ciulin V.,
Kutrowski M.,
Wojtowicz T.,
Deveaud B.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200303172
Subject(s) - trion , exciton , picosecond , biexciton , physics , condensed matter physics , atomic physics , optics , laser
We investigate the nonlinear optical dynamics of excitons and trions in CdTe modulation‐doped quantum wells by time and spectrally resolved pump–probe experiments. We find that the nonlinearities induced by excitons are different from those due to the presence of the trions. From a comparison between the exciton and trion behaviours, we show that, at low temperature, trions are formed from excitons in about 10 picoseconds and, as the temperature is increased, a thermal equilibrium is reached between exciton and trion populations within 5 picoseconds.